thumb screw

同根派生

Assembly consists of thumb screw, hooks, swivel joint, and stem, threaded at one end.
这种总成由翼型螺丝、吊钩、旋转接头和杆子组成，在一端上有螺纹。
captive screw,knurled screw,unloseable screw thumb screw?pannel screw ?
簧螺?,松不?螺?,指旋螺?,面板螺?
He's nipped his thumb in the fastener.
他的姆指被扣件夹住了。
I can't get this screw to come out of the wall.
我无法把这颗螺丝钉从墙上取出。
Knurled thumb screws with collar
滚花高头螺钉